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Problem Page Recorded here are the germination times (in days) for eighteen randomly chosen seeds of a new type of bean: 19, 22, 20, 20, 10, 15, 11, 13, 20, 12, 17, 19, 18, 12, 22, 22, 17, 10 Assuming that germination times are normally distributed, find a 90 % confidence interval for the mean germination time for all beans of this type. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)

What is the lower limit of the confidence interval?

What is the upper limit of the confidence interval?

Answer #1

Recorded here are the germination times (in days) for ten
randomly chosen seeds of a new type of bean: 18, 12, 20, 17, 14,
15, 13, 11, 21, 17. Assume that the population germination time is
normally distributed. Find the 99% confidence interval for the mean
germination time.

Problem Page A certain brokerage house wants to estimate the
mean daily return on a certain stock. A random sample of 14 days
yields the following return percentages: 0.89, -0.27, -2.76, 0.08,
2.29, 2.92, -0.21, -2.69, -2.46, 2.19, -1.58, 1.76, -1.77, 2.57 If
we assume that the returns are normally distributed, find a 95 %
confidence interval for the mean daily return on this stock. Then
complete the table below. Carry your intermediate computations to
at least three decimal places....

The U.S. Federal Seed Act establishes germination rates for
various fruit and vegetable seeds. Watermelon seeds are to meet a
70% germination standard. A skeptical gardener who has not had very
good luck planting watermelons believes that the seed company he
purchases seeds from is not adhering to the 70% federal mandate.
Once a week for 12 weeks, he purchases a pack of 10 watermelon
seeds to act as his sample. He plants the seeds in a greenhouse
with good...

Problem Page A researcher wants to estimate the proportion of
depressed individuals taking a new anti-depressant drug who find
relief. A random sample of 250 individuals who had been taking the
drug is questioned; 207 of them found relief from depression. Based
upon this, compute a 90 % confidence interval for the proportion of
all depressed individuals taking the drug who find relief. Then
complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your...

A random sample of 18 health maintenance organizations (HMOs)
was selected. For each HMO, the co-payment (in dollars) for a
doctor's office visit was recorded. The results are as follows: 10,
11, 6, 12, 8, 10, 10, 6, 11, 7, 9, 9, 12, 7, 8, 11, 8, 12 Under the
assumption that co-payment amounts are normally distributed, find a
confidence interval for the mean co-payment amount in dollars. Then
complete the table below. Carry your intermediate computations to
at least...

The union for a particular industry has determined that the
standard deviation of the daily wages of its workers is $
19
. A random sample of
150
workers in this industry has a mean daily wage of $
112
. Find a
99%
confidence interval for the true mean daily wage of all union
workers in the industry. Then complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to one decimal...

The human resources department of a consulting firm gives a
standard creativity test to a randomly selected group of new hires
every year. This year, 65 new hires took the test and scored a mean
of 112.9 points with a standard deviation of 16.5. Last year,
60
new hires took the test and scored a mean of 117.1 points with a
standard deviation of 19.2. Assume that the population standard
deviations of the test scores of all new hires in...

Pilots who cannot maintain regular sleep hours due to their work
schedule often suffer from insomnia. A recent study on sleeping
patterns of pilots focused on quantifying deviations from regular
sleep hours. A random sample of 27 commercial airline pilots was
interviewed, and the pilots in the sample reported the time at
which they went to sleep on their most recent working day. The
study gave the sample mean and standard deviation of the times
reported by pilots, with these...

A random sample of 16 pharmacy customers showed the waiting
times below (in minutes). 27 31 17 22 22 18 10 15 19 20 23 18 13 22
27 14 Click here for the Excel Data File Find a 90 percent
confidence interval for μ, assuming that the sample is from a
normal population. (Round your standard deviation answer to 4
decimal places and t-value to 3 decimal places. Round your answers
to 3 decimal places.) The 90% confidence interval...

A personal computer manufacturer is interested in comparing
assembly times for two keyboard assembly processes. Assembly times
can vary considerably from worker to worker, and the company
decides to eliminate this effect by selecting a random sample of 10
workers and timing each worker on each assembly process. Half of
the workers are chosen at random to use Process 1 first, and the
rest use Process 2 first. For each worker and each process, the
assembly time (in minutes) is...

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